Artificial leg.



A. M. OPSAL.

ARTIFICIAL LEG.

APPLIUATION FILED MAR.5,1914.

Lww.. Patented July 7, 1914.

'UNITED erariale ramer i ernten.

ARTIFICIAL LEG.

Specification el.' Letters Patent.

Patented July 7, ltll.

Application led March 5, 19.14. Serial No. 8253.552.

Be it known that I, AN'roN lll. llenar, a citizen of the United Staten. residir yat il'linneapolis, in the county ol llennepin and State oll Minnesota, have invented eertain new and useful improvements in .lrtilieial Legs; and l do hereby deelare the liollow ing to be a full, elear, and exact desteription of the invention. auch aa srill enable others skilled in the art to whieh it apperlains to make and use the Same.

My invention has for its ohjeet to provide improved means for producing' natural ton ward Swingin;v movemente of the lower leg lQeetione ot artificial lega eonstrueted lor applieation'to upper lee' ampulationa, and to such ends` generally lQtated. the invention consists of the novel derives and rombiuations oftloviees hereinafter desrribed and defined in the elaims.

ln the aeeompanying drau'izura whieh illustrate the invention` like rharaeter indileate like parts througlu'nlt the several viewa.

Referring to the drawings: Figure Vl is: a l ide elevation showing; au artilioial lego; hai`v` ing my'invention applied thereto; Fig. 2 ia a View eorreapondinoa to Fie'. .1 with Home parts broken away and Home parte reet-ioned; Fig. l is a side elevation allowing in detail a rot-ker which eonstituteS oml oli` the elements of the leg attarlnnent; and ille'. A'lf is a plan View of the roeker shown in detail in Fig.

The numeral l indieates` the upper lee' section or thigh aooket. the numeral 2 the lower leglr seetion and the numeral il the loot ot the artificial leg'` whioh parts may be ol.' the usual or any suitable eonatruetion in which the loufer leg' section is r-onneeted to the upper leg' Section by a Suitable lrnee joint, auch t'or example, as that all'orded by the tubular Shaft l.

The numeral :Sindh-ales the looped eords ot' Isuitable Shoulder eti-apaA or auarwuders. ln thisI preferred ronslruetion. these :-1i|oulder Strap eordsI 5 are paaaed under and aupport upper Sheaies l ol floatingr #heave blocks` 7, which, at their lower ends. rarrj,r lower sheaves 8.

Loeated within the lower rmrtionol` the upper leg' aeetion l and piroled on the liu-- bular knee joint shalt fl, is a, rorlrer in the form ot' a segmental Sheave 5'). 'l`he numeral -10 indicates a flexible :sli-ap. prelerablr in the form of a cord. the lower end ol whirh if; anchored to the bark ol the irneior-"rliate l portion ot' the lower leg,r Seetion and the upper end portion of which runs in al peand attached to the upper portion there ol, at 11. The numeral 12 indicates a pair ol' flexible straps, only one of which is shown also preferably in the -form of cordel, and

l which arepasfred through perforations 13 Atermed n1 the sides of the upper leg: seetions l. The inner and lower ends of thea-e. ps .lf3 are anchored to the rocker or segmental adware lh pre t'erably by means of Screws 1st, that are applicable in either of Several threaded per'torations 15 formed in the `wedge ot' the said rocker 9. The outer ends ol. these latrapa 12 are passed over the lower may be :orang forward by shoulder preasure lhrouglr the ronneelions derwril'ied.even when the upper leelr sretion is rained lo a eonaiderable eleratiorn or in other words, at a very eonaiderahle Al'orueard angle to a vertieal. Otherwise stated, with this` leg;r it is possible not only to very elosely approximale (he natural movements in walking, but also to closely approximate a kieking rnovenient.

'l`he objet-t; in alil'aehiueY the outer ends olt the ,eti-aps: .l2 to the upper leg seetion is to render lhe upward pressure 'troni the Aahoulder strips armrieeable to hold the upper leg; :wrlion :Seated on the slump ol' the upper legi anirnltation. (lbviously, the device de- :a'ribod lor prmlurineV forward and Swinging movements: ol the lower leg" aeetion and for supportingthe leg` l'roin the shoulder straps, is Very simple, ole Small eost. and has no parte that will easilyY get out ol order.

ll'hall l claim is:

l. lu aa arlilieial leg', the eoinljiinatirni with upper and lower leg sections; nonnen-ted by a lcnee joint. ol a roelzer within the artilieial, lee; pirotally mounted at the lineejoint,

ripheral ehannel ot' the, segmental aheave S).

sheaves S ol the laheave blocks 7, are thence V lound in prat-titte that the lower leg Section Dil and]

a connection between said rocker and the lower leg section for swinging the saine forward, and a fiexiblewstrap connected to said rocker, passed outward through a perforation in the side of the upper leg section and 'pivot-ally mounted at the knee joint, a` strap I secured at its lower end to the back of the lower leg` section, and at its upper end rocked on said rocker and secured thereto, alexible strap passed through a perforation y in the side of the upper leg` section and attached at its inner and outer ends, respectively, to said rocker and to said upper leg section, and a shoulder strap connection :in-

cluding` a shea-ve engaged With the looped outer portion of said latter noted Strap.

3. ln an artificial leg, the combination n momen ,ftvith upper and lower leggi,` sections connect ed by a knee joint, of a rocker within said leg pivotally mounted at the knee joint, a strap secured at its lower end to the back of the lower leg section, and at its upper end rocked on said rocker end secured thereto, a flexible strep passed through e perforation ,in the side of the upper leg section and attached at its innerand outer ends, respectively to said rocker and to said upper leg section, and a shoulder strap connection including a sheave engaged with the looped outer portion of said latter notedfstrap, the connection between the said latter noted strap and said rocker bein' adjustable.

ln testimony whereof l a x my signature in presence of two witnesses.

v o ANTN M, (NPSAL. Witnesses HARRY l). lliLconn, F. D. MERCHANT. 

